The optical-storage effect in evaporated films of arsenic trisulfide (As2S3) has been investigated. The physical and chemical aspects of the films were studied using a combination of etching, x-ray diffraction, ir spectroscopy, and annealing experiments. This study of the As2S3 optical-storage medium has culminated in the development of a physical model involving three well-defined states for the medium.
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Keneman et al. (1978) studied this question.
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